![]() ![]() Then, the air-fuel mixture (known as charge) goes to each cylinder. Here, the petrol mixes with the incoming air. However, the engineers moved it from its earlier position in the throttle-body to the intake manifold. It used a ‘common-to-all-cylinders’ injector which supplied petrol in atomized form.Ģnd Generation EFi – Single Point Injection System – Manifold Injection Furthermore, it governed the injection timing accurately with the help of an ECU, sensors, and actuators. Single Point Fuel Injection is the second generation Fuel Injection system which used electronically controlled Fuel Injection (EFi). 1st Generation EFi – Throttle Body Injection System – TBI Single-Point Fuel Injection – It consists of an electrically controlled fuel injector placed above the butterfly valve (throttle) and sprays fuel into the throttle body. Throttle Body Injection is also known as Central Fuel injection system. Later, this system was upgraded to include electrically operated Injector by an ECU which is the first generation Electronic Fuel Injection systems or EFi. Basically, the fuel pump provided sufficient pressure to open the injector hydro-mechanically. Thus, there is a fundamental difference between the earlier generation carburetor & newer generation Fuel Injection (EFi) system.Įarlier, the first generation Fuel Injection featured a simple design which consisted of an injector and a mechanical fuel pump. In this method, the petrol fuel is atomized by forcing it thru’ an injector as opposed to its suction created in a venturi tube in a carburetor which lifts the petrol thru’ its orifices. Hence, it was replaced with first generation Fuel Injection technology. The carburetor, being a mechanical device, was just not fully capable of controlling an accurate air-fuel ratio to meet the growing demands for better emission control. All these terms refer to the newer generation Petrol Injection systems.Įarlier, older engines used simple Fuel Injection (Fi) which replaced the carburetor to overcome some of its shortcomings. All these are the types of fuel injection systems which the gasoline or petrol fuel engines mainly use. EFi stands for Electronic Fuel injection (EFi) whereas MPFi or MPi stands for Multi-Point Fuel injection and GDi stands for Gasoline Direct Injection. ![]()
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